检验灯与灯座接触的有关尺寸，尤其是灯头长度和玻壳肩部形状的组合尺寸。
To check lamp dimensions, particularly the combination of cap length and bulb shoulder shape, for contact-making in a lampholder.
灯头与灯座相连，灯座下设有灯壳和灯管，灯管设在灯 壳内；
The lamp cap is connected with the lamp holder. The lamp shell and the lighting tube are arranged under the lamp holder.
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